FBI evidence response team gather in front of an apartment Wednesday in Orlando, Fla., after an FBI agent shot and killed a man who was questioned in connection with the Boston Marathon bombings. (RED HUBER/ORLANDO SENTINEL/MCT)

ORLANDO, Fla. - An FBI agent shot and killed a Florida man who turned violent while being questioned about the Boston Marathon bombings early Wednesday, the bureau said.

A friend of the dead man identified him as 27-year-old Ibragim Todashev of Orlando, a Chechen who had previously lived in Boston, the Orlando Sentinel and Orlando television stations reported. Two brothers named by the FBI as suspects in the April 15 bombings were also ethnic Chechens with roots in Russia's volatile North Caucasus region.

The FBI said in a statement that a special agent, "acting on the imminent threat posed by the individual, responded with deadly force. The individual was killed and the special agent was transported to the hospital with non-life-threatening injuries."

It said the shooting occurred in Orlando, Fla., while the special agent and other law enforcement agents, including two Massachusetts State Police officers, were interviewing the man about the blasts that killed three people and injured 264 others at the finish line of the Boston Marathon.

"A violent confrontation was initiated by the individual," the FBI said, without providing further details.

Todashev's friend, Khusn Taramiv, said Todashev knew bombing suspect Tamerlan Tsarnaev because both were mixed martial-arts fighters but had no connection to the bombing.

"Back when he used to live in Boston, right, they used to hang out," Taramiv told Central Florida News 13. "He met them few times 'cause he was MMA fighter the other guy was boxer, right. They just knew each other, that's it."

The shooting occurred at an Orlando apartment complex where several people of Chechen descent lived. Taramiv said Todashev and others in the complex had been questioned several times by law enforcement agents since the day the Tsarnaev brothers were identified as the bombing suspects.

Tamerlan Tsarnaev, 26, died in a gunfight with police. His brother, Dzhokhar Tsarnaev, 19, was found hiding in a boat in Watertown, Massachusetts, four days after the bombings. He was charged with crimes that could carry the death penalty if he is convicted.

Tamerlan Tsarnaev had been on a U.S. government database of potential terrorism suspects and the United States had twice been warned by Russia that he might be an Islamic militant, according to U.S. security officials.

In Florida, the Orange County Sheriff's Office said Todashev had been arrested on May 4 and charged with aggravated battery with great bodily harm after getting into a fight with another man over a parking space at an Orlando shopping mall.

Police said they arrested Todashev as he was leaving the scene and found a man lying on the ground near a "considerable" amount of blood.

Todashev told police the other man came at him swinging and the two started fighting. "Todashev said he was only fighting to protect his knee because he had surgery in March," the report said.

The man, who suffered a split upper lip and had several teeth knocked out of place, did not to press charges against Todashev, who was released from jail on a $3,500 bond, a sheriff's spokeswoman said.

Another neighbor, who asked not to be identified, said Todashev was frequently seen shadow boxing as he jogged around the small lakes that dotted the apartment complex where he lived two blocks from the Universal Orlando theme park.